Partially these are based on knowledge I already have, while others had me just as curious and required some searching:

If a turtle doesn't have a shell, it is dead.

"The main ingredient in super glue is a chemical called cyanoacrylate. This resin uses water and air to cure, explaining the age old question of why super glue doesn't harden in the tube. You may be thinking to yourself 'there's no water on that coffee cup I just glued back together', but you're undoubtedly mistaken. Almost everything in the world has at least minute traces of water on the surface, believe it or not, and trace amounts are all cyanoacrylate needs to cure."http://www.ehow.com/how-does_4570225_super-glue-work.htmlhttp://www.howstuffworks.com/question695.htm

"An assassination is the targeted killing of a public figure, usually for political purposes.

Assassinations may be prompted by religious, ideological, political, or military reasons. Additionally, assassins may be motivated by financial gain, revenge, or personal public recognition.

Assassination may also refer to the government-sanctioned killing of opponents or to targeted attacks on high-profile enemy combatants."http://en.wikipedia.org/wiki/Assassination

"Marbles" are so called because when originally discovered/invented, most more resembled marble in the materials of which they were comprised.http://en.wikipedia.org/wiki/Marbles

In regard to the compass question—number 10 on this list: http://helios.gsfc.nasa.gov/qa_sp_ev.html

The TV set thing is one I'd always wondered about, too. Surprisingly so, have many others. It took me awhile before I was finally able to find an answer in this thread of conversation: http://answers.google.com/answers/threadview?id=167987"Prior to 1935 (yes, there was TV prior to 1935), televisions were mechanical devices that were not entirely electronic. The device was made up of a 'set' of specific items, namely a small motor, a spinning disk and a neon light. Without any of these, (i.e., the set was incomplete) the device would not work. The term 'mechanical television' eventually gave way to the term 'television set' to describe all types of TV's, though other less popular and shorter lived names such as 'Televisor' and 'Shadowgraph' were used briefly to refer to certain models."

And here's a funny explanation, from the same thread:"Why is it called a TV set when you only get one? When TVs are manufactured, they leave the assembly lines as a gelatinous fluid.They only become usable once they have set. The term 'TV set' first came about due to customer concern in the 1940s that they were buying TVs that had not set properly yet."

As for the conundrum about human body temperature normally being 98.6 degrees, yet our aversion to that being the case in outside temperature, I like to think the most obvious answer is the best: clothing.